s = 2
p = 6
d = 10
f = 14
Difference by 4
1s
2s 2p
3s 3p 3d
4s 4p 4d 4f
5s 5p 5d 5f
6s 6p 6d 6f
7s 7p 7d 7f
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^14 5d^10 6p^6 7s^2 5f^14 6d^10 7p^6
Ca = 20 electrons
Ca = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2
Ge = 32 electrons
Ge = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^2
Ru = 44 electrons
Ru = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^6
Au+ = 78 electrons (i.e., + makes it lose one of it's 79 electrons)
Au+ = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 4f^14 5d^10
S^-2 = 18 electrons
S^-2 = 1s^2 2s^2 2p^6 3s^2 3p^6
Ag+ = 46 electrons
Ag+ = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^6
Helpful Links (the people who answer questions on Yahoo ahhh-maze me):
ahh-mazing person
S^-2 = 1s^2 2s^2 2p^6 3s^2 3p^6
Ag+ = 46 electrons
Ag+ = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^6
Helpful Links (the people who answer questions on Yahoo ahhh-maze me):
ahh-mazing person
